Fault detection device for inverter system
View Patent ↗To provide a fault detection device for an inverter system, that detects a fault in the inverter system including an inverter circuit 2 that converts DC power into AC power and a motor 5 driven thereby. When a driving start signal Sig 1 of the inverter circuit 2 is input, a test voltage applying unit 20 applies a predetermined first test voltage to a current measuring unit 10 that measures current flowing in the inverter circuit 2 , and it is determined whether the current measuring unit 10 has failed, based on the first test voltage. A control unit 30 applies a predetermined second test voltage to the inverter circuit 2 and the motor 5 , and it is determined whether the inverter circuit 2 and a motor coil have failed, based on the second test voltage.
1. A fault detection device for an inverter system, that detects a fault in the inverter system, the inverter system including:
an inverter circuit which converts input DC power into AC power;
a motor which is driven by the inverter circuit;
a current measuring unit that measures current flowing in the inverter circuit;
a test voltage applying unit which applies a predetermined first test voltage to the current measuring unit when a driving start signal of the inverter circuit is input, whether the current measuring unit has failed being determined based on the applied predetermined first test voltage; and
a control unit which applies a predetermined second test voltage to the inverter circuit and the motor, whether the inverter circuit and a coil of the motor have failed being determined based on the applied second test voltage;
wherein a driving start control of the inverter circuit is stopped upon determining failure of the current measuring unit based on the first test voltage;
wherein the driving start control of the inverter circuit is stopped upon determining the inverter circuit and the coil of the motor have failed based on the second test voltage after determining the current measuring unit is normal; and
wherein driving of the inverter circuit is started upon determining the inverter circuit and the coil of the motor are normal.
2. The fault detection device for an inverter system according to claim 1 , wherein when the first test voltage amplified by an amplification circuit provided in the current measuring unit is greater than an upper limit value of a voltage range that is determined in advance based on the first test voltage or is less than a lower limit value thereof, the control unit determines that the current measuring unit has failed.
3. The fault detection device for an inverter system according to claim 1 , wherein when the second test voltage amplified by an amplification circuit provided in the current measuring unit is greater than an upper limit value of a voltage range that is determined in advance based on the second test voltage or is less than a lower limit value thereof, the control unit determines that the inverter circuit and the coil of the motor have failed.
4. The fault detection device for an inverter system according to claim 1 , wherein when a predetermined time elapses from the start of application of the second test voltage, the control unit determines whether the inverter circuit and the coil of the motor have failed.